Alert archive / New York / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 10, NWS Buffalo, NY

April 27, 2011Allegany County, Livingston County, New York

NWS Buffalo, NY issued this severe thunderstorm warning at Apr 27, 2011, 6:17 PM EDT for Allegany County, Livingston County, New York. It was in force for 43 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 27, 2011, 6:17 PM EDT (22:17 UTC)
Expired: Apr 27, 2011, 7:00 PM EDT
In force: 43 min
Issued by: NWS Buffalo, NY
Area: Storm-based polygon

Counties Allegany County, NY, Livingston County, NY

The radar

The Buffalo radar (KBUF), 92 km from the middle of the area, began a volume at 22:21 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 27, 6:50 PM EDT	TSTM WND DMG	Springwater, NY	WIRES DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 27, 3:10 PM EDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 10.3 hours before the alert went out and 88 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 27 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 987 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

871 
WUUS51 KBUF 272217
SVRBUF
NYC003-051-272300-
/O.NEW.KBUF.SV.W.0010.110427T2217Z-110427T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BUFFALO NY
617 PM EDT WED APR 27 2011

THE NATIONAL WEATHER SERVICE IN BUFFALO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ALLEGANY COUNTY IN WESTERN NEW YORK
  SOUTHERN LIVINGSTON COUNTY IN WESTERN NEW YORK

* UNTIL 700 PM EDT

* AT 616 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
  FROM BELFAST TO 23 MILES SOUTH OF BELFAST...OR ALONG A LINE
  EXTENDING FROM 19 MILES WEST OF ARKPORT TO 13 MILES NORTHWEST OF
  WELLSVILLE TO 10 MILES SOUTHEAST OF OLEAN...AND MOVING NORTHEAST AT
  55 MPH.

* SOME LOCATIONS IN THE WARNING INCLUDE...
  GROVELAND...
  CONESUS...
  HEMLOCK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING
FOR WESTERN NEW YORK.

&&

LAT...LON 4223 7814 4242 7817 4285 7761 4282 7759
      4277 7759 4276 7762 4268 7760 4266 7748
      4258 7749 4257 7765 4253 7767 4253 7771
      4239 7772 4199 7825 4199 7830
TIME...MOT...LOC 2217Z 224DEG 50KT 4239 7805 4231 7804
          4203 7824

$$

HIBBERT

1 follow-up statement

819 
WWUS51 KBUF 272237
SVSBUF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BUFFALO NY
637 PM EDT WED APR 27 2011

NYC003-051-272300-
/O.CON.KBUF.SV.W.0010.000000T0000Z-110427T2300Z/
ALLEGANY NY-LIVINGSTON NY-
637 PM EDT WED APR 27 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM EDT
FOR SOUTHERN LIVINGSTON AND NORTHEASTERN ALLEGANY COUNTIES...

AT 635 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM GROVELAND TO OSSIAN CENTER TO CANASERAGA...OR ALONG A
LINE EXTENDING FROM 8 MILES NORTHWEST OF DANSVILLE TO DANSVILLE TO 6
MILES NORTHWEST OF ARKPORT...MOVING NORTHEAST AT 55 MPH.

SOME LOCATIONS IN THE WARNING INCLUDE...
  CONESUS...
  HEMLOCK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT WEDNESDAY EVENING
FOR WESTERN NEW YORK.

&&

LAT...LON 4223 7806 4258 7796 4285 7761 4282 7759
      4277 7759 4276 7762 4268 7760 4266 7748
      4258 7749 4257 7766 4253 7767 4253 7771
      4239 7772
TIME...MOT...LOC 2237Z 227DEG 47KT 4267 7778 4257 7774
          4245 7777

$$

HIBBERT

The office that day

Everything else NWS Buffalo, NY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 10:21 PM EDT	Areal Flood Advisory	BUF	Ontario, Wayne	3 hr
Apr 27, 1:57 PM EDT	Gale Warning	BUF		30 hr
Apr 27, 1:57 PM EDT	Small Craft Advisory	BUF		20 hr
Apr 27, 1:58 PM EDT	Flash Flood Watch	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	22 hr
Apr 27, 1:58 PM EDT	Wind Advisory	BUF	Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more	26 hr
Apr 27, 4:25 PM EDT	Special Marine Warning	BUF		50 min
Apr 27, 4:49 PM EDT	Special Weather Statement	BUF	Chautauqua	41 min
Apr 27, 5:05 PM EDT	Special Marine Warning	BUF		25 min
Apr 27, 5:06 PM EDT	Severe Thunderstorm Warning	BUF	Cattaraugus, Chautauqua, Erie	54 min
Apr 27, 5:43 PM EDT	Tornado Warning	BUF	Allegany, Cattaraugus	32 min
Apr 27, 5:51 PM EDT	Special Marine Warning	BUF		84 min
Apr 27, 6:11 PM EDT	Special Weather Statement	BUF	Genesee, Livingston, Monroe, Wyoming	64 min
Apr 27, 6:52 PM EDT	Special Weather Statement	BUF	Ontario, Wayne	53 min
Apr 27, 6:56 PM EDT	Special Marine Warning	BUF		94 min
Apr 27, 6:56 PM EDT	Severe Thunderstorm Warning	BUF	Livingston, Ontario, Wayne	49 min
Apr 27, 7:32 PM EDT	Severe Thunderstorm Warning	BUF	Ontario	13 min
Apr 27, 7:39 PM EDT	Areal Flood Advisory	BUF	Allegany, Livingston, Monroe, Ontario, Wayne	3 hr
Apr 27, 7:42 PM EDT	Severe Thunderstorm Warning	BUF	Cayuga, Ontario, Wayne	48 min

Nearby

Severe Thunderstorm Warnings in New York, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.